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A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability that the sample mean is Between 74 and 76.
How should the candidate purchase the five commercials to maximize the estimated number of additional voters?
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
A radio station wants to know if residents in their area are in favor of a proposed tax increase. They invite listeners to call in to respond to the poll. 645 of the 800 who responded were against the tax.
Determine the mean number of times the machine was used per day.
Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
Recognize and explain potential threats (up to 3) to external validity.
For an arch chosen at random in Arches National Park, use the preceding information to estimate the probability that the height of the arch poening is:
Find out a linear equation in the form P = mt + b (y = mx + b) that gives the population, P, t years from 2010.
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
The response time for Denver police to respond to emergency calls is 8.4 minutes with a standard deviation 1.7 find the probability that the response time for a call between 5 and 10 minutes.
Determine relative frequency of X=4? Generate the cumulative frequencies.
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